Btw, if the $action variable comes from user input - most likely in a CGI script -, you will want to check that it actually contains the name of a function you have intended for public calling. That's easiest to make sure if you use a hash to map names to coderefs.

Alternatively, you could put the public functions in a package and use the symbol table hash to get at them.

if(exists $Action::{$action}) {
    $Action::{$action}->(@params);
}
else {
    croak "No such action '$action'";
}

package Action;

sub post {
    # ...
}
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